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From "Thomas Draier (JIRA)" <j...@apache.org>
Subject [jira] Created: (JCR-2623) Deadlock in cluster when registering node types
Date Thu, 06 May 2010 09:50:49 GMT
Deadlock in cluster when registering node types
-----------------------------------------------

                 Key: JCR-2623
                 URL: https://issues.apache.org/jira/browse/JCR-2623
             Project: Jackrabbit Content Repository
          Issue Type: Bug
          Components: clustering
    Affects Versions: 2.0.0, 1.5.0
            Reporter: Thomas Draier


Hi,

I've got a deadlock when using clusters and making node types registration on both nodes at
the same time - One of the node starts reading journal entries before registering the node
type, and is then blocked when trying to register types - both thread locks the journal and
the node types registry :

"ClusterNode-exp01" id=151 idx=0x244 tid=2384 prio=5 alive, in native, blocked, daemon
    -- Blocked trying to get lock: org/apache/jackrabbit/core/nodetype/NodeTypeRegistry@0x00000001923C9660[thin
lock]
    at jrockit/vm/Threads.sleep(I)V(Native Method)
    at jrockit/vm/Locks.waitForThinRelease(Locks.java:1209)
    at jrockit/vm/Locks.monitorEnterSecondStageHard(Locks.java:1342)
    at jrockit/vm/Locks.monitorEnterSecondStage(Locks.java:1259)
    at jrockit/vm/Locks.monitorEnter(Locks.java:2466)
    at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:223)
    at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.externalRegistered(NodeTypeRegistry.java:691)
    at org/apache/jackrabbit/core/cluster/ClusterNode.process(ClusterNode.java:925)
    at org/apache/jackrabbit/core/cluster/NodeTypeRecord.process(NodeTypeRecord.java:202)
    at org/apache/jackrabbit/core/cluster/ClusterNode.consume(ClusterNode.java:798)
    at org/apache/jackrabbit/core/journal/AbstractJournal.doSync(AbstractJournal.java:213)
    at org/apache/jackrabbit/core/journal/AbstractJournal.sync(AbstractJournal.java:188)
    at org/apache/jackrabbit/core/cluster/ClusterNode.sync(ClusterNode.java:315)
    at org/apache/jackrabbit/core/cluster/ClusterNode.run(ClusterNode.java:286)
    at java/lang/Thread.run(Thread.java:619)

...

"[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'" id=15 idx=0x44
tid=4348 prio=5 alive, in native, waiting, daemon
    -- Waiting for notification on: EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock@0x00000001921DD110[fat
lock]
    at jrockit/vm/Threads.waitForNotifySignal(JLjava/lang/Object;)Z(Native Method)
    at java/lang/Object.wait(J)V(Native Method)[optimized]
    at EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock.acquire(WriterPreferenceReadWriteLock.java:240)
    ^-- Lock released while waiting: EDU/oswego/cs/dl/util/concurrent/WriterPreferenceReadWriteLock$WriterLock@0x00000001921DD110[fat
lock]
    at org/apache/jackrabbit/core/journal/AbstractJournal.lockAndSync(AbstractJournal.java:250)
    at org/apache/jackrabbit/core/journal/DefaultRecordProducer.append(DefaultRecordProducer.java:51)
    at org/apache/jackrabbit/core/cluster/ClusterNode.registered(ClusterNode.java:468)
    at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:233)
    ^-- Holding lock: org/apache/jackrabbit/core/nodetype/NodeTypeRegistry@0x00000001923C9660[thin
lock]
    at org/apache/jackrabbit/core/nodetype/NodeTypeRegistry.registerNodeTypes(NodeTypeRegistry.java:208)
    at org/apache/jackrabbit/core/nodetype/NodeTypeManagerImpl.registerNodeTypes(NodeTypeManagerImpl.java:431)
    at org/apache/jackrabbit/core/nodetype/NodeTypeManagerImpl.registerNodeTypes(NodeTypeManagerImpl.java:282)


- thread1 reads an entry from the journal, acquire a read lock on the Journal.rwLock, start
reading entries. 

- Second thread start registering new node types. It gets the NodeTypeRegistry lock. Then
tries to write journal entries for new node types - but blocks on getting writeLock for Journal.rwLock.


- Back to first thread, continues reading journal entries, find a NodeTypeRecord of type register
- tries to register the nodeType. NodeTypeRegistry is still own by thread2, both threads are
blocked.


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